DISEASES OF THE LYMPHATIC TISSUES 121 
by the parent, but so far as can be determined this has 
not been adequate to cause tracheal compression. In a 
few cases of rachitis in the canines, the organ is large and 
pale along with the rest of the lymphatic system. In one 
of the tumors of the mediastinum to be discussed, the 
suspicion arose that the growth originated in the thymus ; 
adenomata and sarcomata have been described in the 
lower animals. 
TUBEECULOSTS. 
Tuberculosis of the superficial lymph glands is rare 
as an independent lesion in the lower animals. Dr. C. Y. 
White was fortunate in seeing a monkey with a chain of 
fibrocaseous nodes in the cervical region, upon which 
before death he offered the suggestion that it was of 
tuberculous nature. In Primates almost all drainage 
glands exhibit some miliary or caseous process. One 
monkey rejected upon the tuberculin test had what was 
apparently a primary lesion in the glands at the tracheal 
bifurcation. In the Ungulata, lymphatic tuberculosis 
assumes two forms, the caseous and the cellular. The 
former is generally understood while the latter is more 
uncommon. It is occasionally seen in the ''fungous 
tubercle" of cows, but we have seen it in deer and in 
another order, Carnivora. In the latter, tuberculosis being 
uncommon, examples in the lymph nodes were noted but 
twice, once caseous and once solid; this latter was made 
up of firm, homogeneous yellow pink masses of glands in 
the mediastinum, showing under the microscope solidly 
packed epithelioid and giant cells. 
Lymphatic tuberculosis in the birds is rare ; only one 
case is recalled (unfortunately record cannot be found) 
as small yellow, discrete firm nodules in the mediastinum 
and neck. The minute picture was of a solid arrangement 
of large vacuolated mono- and polynucleated cells which 
were so packed with bacilli that the preparation could 
not be decolorized. 
9 
